setting intial value for choicefield in admin panel

I am using admin panel and using get_form to retrieve one of my table
objects. I have a choicefield in this object but I don't know how to
set the default. I have saw numerous examples of using the
following:

class MyAdmin(admin.ModelAdmin):
list_display = ('rank', 'name')
def get_form(self,request,obj=None,**kwargs):
return super(MyAdmin,self).get_form(request, obj=None, **kwargs)

rank is a choicefield.

choices are 1,2,3,4

right now it defaults to '-------' and I want it to default to 1.

I'm wanting to do this because without it i'm getting a "Incorrect
integer value: '' for column 'rank' at row 1 error

the '------' is giving me a empty value and I need something there or
a method to handle this error ?

Thanx

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